"I think everybody was surprised," Cory Monteith says in this behind-the-scenes look at the filming of Glee's season two finale. Executive producer Dante Di Loreto adds: "We were hoping people would be enthusiastic, but we didn't know they'd be that enthusiastic." Thankfully, Glee fans know when to scream in fan-girl ecstasy, and when to zip the lips to respect the filming. And Matthew Morrison really appreciates that, as he'll tell you in the video.

Check out our exclusive clip from Glee: The Complete Second Season, out on DVD and Blu-Ray Sept. 13. Mark that date down on your Lea Michele calendars.